Extra check for the Busco parameter

[muffato]

Description of feature

In #187, #122, and #126, the user gave a Buso path that contained /lineages at the end. This made Busco crash because it tried to use /path/to/lineages/lineages/arthropoda_odb10.

In #131 and #151 the user reported another error but if we pay attention to their command-line, they had also included /lineages, so it must have failed for that as well.

Given how frequently it seems to happen, I suggest to check whether the input parameter is called lineages, and take the parent directory instead. This way, it'll just work regardless of what the user inputs.

[yumisims]

I will add validation statement for this issue.